Many ideas/techniques/whatever are good in theory. But for something to actually work, it needs to be good in practice. Right now, all of the practitioners are

Many ideas/techniques/whatever are good in theory. But for something to actually work, it needs to be good in practice. Right now, all of the practitioners are voting with their feet. That is strong evidence about the (non-)viability of permaculture. I'm open to being wrong about this, but there is a huge chasm between what works on paper or in small scale experiments and what works in the real world, at scale. If permaculture is a viable way to produce food at the scale necessary to feed 7 billion people, we would be in the midst of a wide-scale roll out. But we're not. So I remain skeptical.